1. Introduction
Thank you for choosing the KORAD U200 Series Switching DC Power Supply. This manual provides essential information for the safe and efficient operation of your U202 or U203 model. These digital control DC power supplies are designed for laboratory use, electronic maintenance, product development, testing, and educational applications, offering high precision, stability, low ripple, and low noise output.
The U200 series features a lightweight and portable design, making it easy to handle. Key functionalities include precise voltage and current adjustment, power display, 0.1mA current display, over-current and over-temperature protection, dual 24W fast charging USB ports, SetPoint shutdown memory, and a digital potentiometer for quick adjustments.
2. Safety Instructions
- Always connect the power supply to a grounded outlet.
- Ensure the input voltage selector switch on the rear panel matches your local mains voltage (110V or 220V) before connecting to power.
- Do not operate the power supply in wet or damp conditions.
- Avoid blocking ventilation openings to prevent overheating.
- Do not open the casing; there are no user-serviceable parts inside. Refer servicing to qualified personnel.
- Disconnect power before making any output connections or adjustments to prevent electric shock or damage to connected devices.
- Use appropriate test leads and ensure they are in good condition.
- Do not exceed the maximum voltage and current ratings of the power supply or the device under test.
3. Package Contents
Upon unpacking, please verify that all items are present and in good condition:
- 1 x KORAD U200 Series DC Power Supply (U202 or U203 model)
- 1 x User Manual
- 1 x Power Cord (1.2 meters)
- 1 x Test Line (output leads)
4. Product Overview
4.1 Front Panel Controls and Indicators
- Voltage Coarse Adjust Knob: Adjusts output voltage in larger increments (Step value 1V).
- Voltage Fine Adjust Knob: Adjusts output voltage in smaller increments (Step value 0.01-1V).
- Current Adjust Knob: Adjusts output current.
- Voltage Display: Shows the set or actual output voltage.
- Current Display: Shows the set or actual output current with 0.1mA resolution.
- Power Display: Shows the output power in Watts.
- OCP (Over-Current Protection) Button: Toggles Over-Current Protection mode.
- ON/OFF Button: Controls the main output port power.
- Dual USB Max 24W Ports: Fast charging USB ports, each providing up to 24W.
- Main Power Switch: Turns the entire unit on or off.
- Output Terminals (+, -): Red for positive, Black for negative output.
- GND Terminal: Ground connection.
4.2 Rear Panel Features
- Cooling Fan: Provides necessary ventilation for heat dissipation.
- AC 220/110V Transfer Switch: Selects the appropriate input voltage (110V or 220V).
- AC Power Input Port: Connects the power cord to the mains supply.
- Lockwire Location: For security or calibration seals.
5. Setup
- Unpacking: Carefully remove the power supply and all accessories from the packaging. Inspect for any signs of damage.
- Voltage Selection: Locate the AC 220/110V transfer switch on the rear panel. Ensure it is set to match your local mains voltage. Incorrect setting can cause severe damage to the unit.
- Power Connection: Connect the provided power cord to the AC power input port on the rear panel and then to a grounded electrical outlet.
- Placement: Place the power supply on a stable, level surface, ensuring adequate ventilation around the unit. Do not block the cooling fan or air vents.
- Output Connection: Before connecting any device to the output terminals, ensure the power supply's main power switch is OFF. Connect your test leads to the red (+) and black (-) output terminals. Connect the other end of the test leads to your device under test, observing correct polarity.
6. Operating Instructions
6.1 Basic Operation
- Power On: Flip the main power switch on the front panel to the 'ON' position. The display will illuminate.
- Setting Voltage: Use the 'Voltage Coarse' and 'Voltage Fine' knobs to set the desired output voltage. The voltage display will show the set value.
- Setting Current: Use the 'Current' knob to set the desired current limit. This acts as a maximum current the power supply will deliver. The current display will show the set value.
- Activating Output: Press the 'ON/OFF' button to enable the main output. The output terminals will now supply power according to your set voltage and current.
- Monitoring Output: The Voltage, Current, and Power displays will show the real-time output values.
- Power Off: Press the 'ON/OFF' button to disable the main output. Then, flip the main power switch to the 'OFF' position.
6.2 Advanced Features
- Over-Current Protection (OCP): Press the 'OCP' button to activate or deactivate the over-current protection. When OCP is active, if the output current exceeds the set limit, the power supply will automatically shut down the output to protect the connected device.
- SetPoint Shutdown Memory: The power supply retains the last set voltage and current values even after being powered off. This feature allows for quick recall of previous settings upon next boot-up.
- Digital Potentiometer Quick Adjustment: The adjustment knobs are digital potentiometers, allowing for precise and rapid setting of voltage and current.
- Dual USB Fast Charging Ports: Two USB ports are available on the front panel, each capable of delivering up to 24W for fast charging compatible devices. These ports operate independently of the main DC output.
7. Specifications
| Parameter | U202 (0-30V/0-5A) | U203 (0-30V/0-10A) |
|---|---|---|
| Voltage Range | 0-30V adjustable | |
| Current Range | 0-5A adjustable | 0-10A adjustable |
| Load Regulation (Voltage) | ≤ 0.01% + 2mV | |
| Load Regulation (Current) | ≤ 0.1% + 2mA | ≤ 0.1% + 5mA |
| Linear Regulation (Voltage) | ≤ 0.01% + 3mV | |
| Linear Regulation (Current) | ≤ 0.1% + 3mA | |
| Set Resolution (Voltage) | 10mV | |
| Set Resolution (Current) | 1mA | |
| Setting Accuracy (25°C ± 5°C) (Voltage) | ≤ 0.5% + 10mV | |
| Setting Accuracy (25°C ± 5°C) (Current) | ≤ 0.5% + 5mA | |
| Ripple (20Hz - 20M) (Voltage) | ≤ 20mVrms | |
| Ripple (20Hz - 20M) (Current) | ≤ 20mArms | |
| Temperature Coefficient (Voltage) | ≤ 150ppm | |
| Temperature Coefficient (Current) | ≤ 150ppm | |
| Read Resolution (Voltage) | 10mV | |
| Read Resolution (Current) | 1mA | |
| Read Temperature Coefficient (Voltage) | ≤ 150ppm | |
| Read Temperature Coefficient (Current) | ≤ 150ppm | |
| Output Power | 201 - 300W | |
| Input Voltage | 110V/220V (selectable) | |
| Operating Environment | Indoor use, Altitude: ≤ 2000m, Ambient temperature: 0-40°C, Relative humidity: ≤ 80% | |
| Weight/Dimensions | 1.5 kg / 252(L) x 95(W) x 177(H) mm | |
| Storage Environment | Ambient temperature: -10°C ~ 70°C, Relative humidity: ≤ 70% | |
8. Troubleshooting
If you encounter issues with your KORAD DC Power Supply, consider the following common troubleshooting steps:
- No Power: Check the main power switch, the power cord connection, and the input voltage selector on the rear panel. Ensure the wall outlet is functioning.
- No Output: Verify that the 'ON/OFF' button for the main output is pressed (output enabled). Check that the voltage and current limits are set to appropriate values.
- Output Voltage/Current Not Stable: Ensure connections are secure. Check for any short circuits or open circuits in your test setup.
- Over-Current Protection (OCP) Triggered: If the OCP light is on and output is off, it means the current limit was reached. Reduce the load or increase the current limit setting.
- Over-Temperature Protection: If the unit feels excessively hot and shuts down, ensure the cooling fan and vents are not obstructed. Allow the unit to cool down in a well-ventilated area.
- Incorrect Readings: Ensure proper connection of test leads and that the device under test is functioning correctly.
For persistent issues, contact customer support.
9. User Tips
No specific user tips from reviews or Q&A were available for this product. However, general tips for DC power supplies include:
- Always set your voltage and current limits before connecting your load and enabling the output. This prevents accidental over-voltage or over-current to sensitive components.
- When working with new circuits, start with a low current limit and gradually increase it as needed.
- Utilize the OCP feature to protect your circuits from unexpected current surges.
- Keep the power supply clean and free from dust to ensure optimal performance and longevity.
10. Maintenance
- Cleaning: Regularly clean the exterior of the power supply with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Ventilation: Ensure that the cooling fan and all ventilation openings are kept clear of dust and obstructions to maintain proper airflow and prevent overheating.
- Storage: When not in use for extended periods, store the power supply in a cool, dry place, away from direct sunlight and extreme temperatures.
- Inspection: Periodically inspect the power cord and test leads for any signs of damage. Replace them if necessary.
11. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the seller's documentation or contact the point of purchase. Keep your purchase receipt as proof of purchase.